I am regularly downloading various files (htm, pdf, doc) from the internet through my browser for learning and education purposes and save them in my downloads folder.
Over time I cannot remember what file is about what topic so I am looking for a software (standalone Windows or Firefox compatible) that would act like a download manager in a way that I would be able to see a date-specific index of files and have the capacity for me to add a description for each download so that when I want to find something after a year I can get to it quickly.
Alternatively, the software could be a file manager that would scan actively scan a designated folder (such as the download folder) and when a new file is saved it would prompt me to add it to the index and add a description.